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• W2078782014 abstract "Phosphate treatment has emerged as a widely accepted approach to immobilize Pb in contaminated soils and waste media, relying on the formation of the highly insoluble mineral pyromorphite as solubility-controlling phase for Pb. As such, phosphate treatment has been proposed as a Best Management Practice (BMP) for firing ranges where Pb occurs in its metallic forms and several other phases (carbonates, oxides). While pyromorphite thermodynamically has the potential to control Pb solubility at low levels, its formation is kinetically controlled by pH, the solubility of the phosphate source, and the solubility of Pb species. Treatability studies have shown that excess quantities of soluble and acidic phosphate sources, such as phosphoric acid, are necessary for successful in situ treatment. Even under these conditions, Extended X-ray Absorption Fine Structure (EXAFS), the only reliable method to identify and quantify Pb speciation, showed that Pb conversion to pyromorphite in in situ treated soils was less than 45% after 32 months. Furthermore, the use of lime (CaO) to restore soil pH in acidified soil treatments inhibited further conversion. Additionally, phosphate treatment is known to reduce bioavailability through pyromorphite formation in the intestinal tract, and the phytoaccumulation of Pb; both desirable effects for Pb-impacted areas. Given the costs of phosphate treatment, the use of biogenic phosphate sources, such as bone meal, may be a more environmentally sustainable approach toward this end. In the many studies focusing on phosphate treatment, the attendant P leaching and eutrophication have been largely overlooked, along with other issues such as the enhanced leaching of oxyanionic contaminants, such as Se, As and W. The success and sustainability of applying phosphate as a BMP in firing range soils therefore remain questionable." @default.
• W2078782014 created "2016-06-24" @default.
• W2078782014 creator A5036875371 @default.
• W2078782014 creator A5056988741 @default.
• W2078782014 creator A5065153265 @default.
• W2078782014 date "2007-06-01" @default.
• W2078782014 modified "2023-10-17" @default.
• W2078782014 title "Phosphate application to firing range soils for Pb immobilization: The unclear role of phosphate" @default.
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• W2078782014 doi "https://doi.org/10.1016/j.jhazmat.2007.02.008" @default.
• W2078782014 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/17360110" @default.
• W2078782014 hasPublicationYear "2007" @default.
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